DRV8814: Overcurrent reset time

Matteo Marioni

Part Number: DRV8814

The datasheet mentions this in order to clear the overcurrent error:

7.4.6.1 Overcurrent Protection (OCP)
An analog current limit circuit on each FET limits the current through the FET by removing the gate drive. If this
analog current limit persists for longer than the OCP time, all FETs in the H-bridge will be disabled and the
nFAULT pin will be driven low. The device will remain disabled until either nRESET pin is applied, or VM is
removed and re-applied.

Can you please let us know what is the minimum time for which nRESET pin should be applied in order to clear the OCP condition?
Best regards,

Matteo Marioni

over 4 years ago

0 Wang5577 over 4 years ago

TI__Guru 56650 points

Matteo,

There is no nRESET minimum time spec in the datasheet. Do you have any issue to reset the OCP latch-off?

0 Matteo Marioni over 4 years ago in reply to Wang5577

Prodigy 20 points

Dear Wang,
I know that the datasheet doesn't specify a value for that, that's why I asked.
In our design the nRESET line is in common with other devices, so I have to be as fast as possible when using it (it acts and disables several devices on our board).
Please provide a minimum value which guarantees the OCP clearing function.
Best regards,

Matteo Marioni

0 Wang5577 over 4 years ago in reply to Matteo Marioni

TI__Guru 56650 points

Matteo,

I just checked the original design spec: the nRSET timing should be 20us or longer to guarantees the OCP clearing function.

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DRV8814: Overcurrent reset time